Polishing-machine.



G. M. NICHOLS.

POLISHING MACHINE.

APPLICATION FILED D30. 8, 190B.

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No. 873,583 PATENTED DEG. 10,1907.

0. M. NICHOLS.

POLISHING MACHINE. APPLICATION FILED nme, 1906.

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. r N m 3 7 N k lwoefil'oz CHARLIE M. NICHOLS, OF BEAUMONT, TEXAS.

POLISHING-MACHINE Specification of Letters Patent.

Patented Dec. 10, 1907.

Application filed December 8. 1906- Serial No. 346,955.

T 0 all whom it may concern:

Be it known that I, CHARLIE M. NioHoLs, a citizen of the United States,residing .at Beaumont, in the county of Jefferson and State of Texas,have invented new and useful Improvements in Polishing-Machines, ofwhich the following is a specification.

This invention relates to polishing machines, designed especially fortreating and polishing the interior of gun barrels or other metal tubingfor the purpose of removing pits or rust therefrom, and embodies in itsorganization a rotary mandrel for operating the polishing tool and areciprocatory carriage in which the tube is clamped or other wisesecured and through the medium of which a longitudinal, reciprocatorymovement is imparted to the tube relative to the tool during thepolishing operation.

The invention has for its objects to provide a comparatively simple,inexpensive device of this character whereby the interior ofthe tubewill be rapidly and thoroughly cleaned and polished, one in which thetool and man drel will be properly driven and the tube reciprocatedrelative thereto in effecting the polishing action, and one in which theamount of movement imparted to the carriage may be varied at will toaccord with the length of the tube being treated.

A further object of the invention is to provide an improved-andsimplified form of tool for use in performing the polishing operation,

one whereby tubes having a tapered bore, as in the instance of chokebarrels, may be treated without injury, and one which in action willconform readily to the bores and effect the cleaning and polishingwithout marring the interior of the tube.

With these and other objects in view, the invention comprises the novelfeatures of construction and combination of parts more fully hereinafterdescribed.

In the accompanying drawings: Figure 1 is' a side elevation of a machineembodying the invention. Fig. 2 is a top plan view of the same. Fig. 3is a cross section taken on the line 33 of Fig. 2. Fig. 4 is a detailcross section taken on the line 44 of Fig. 2. Fig. 5 is aperspective-view of the crank arm included in the carriage reciprocatingmechanism. Fig. 6 is a perspective view-,of the polishing tool. Fig. 7is a section taken centrally and longitudinally through the head of thetool, showing the parts on an enlarged scale. Fig. 8 is a cross sectiongtaken on the line 88 of Fig. 7. Fig. 9 is a view of a modified form ofpolishing tool. Fig. 10 is a detailview in cross section of the deviceshown in Fig. 9.

Referring to the drawings, it will be seen that the main frame of themachine comprises a horizontal bed or table 1 sustained on supportinglegs 2 and embodying a pair of longitudinal side bars or rails 3 abovethe forward portions of which there is arranged a pair of longitudinalguide members or rods 4 terminally fixed in bearings 5 attached to therails 3, there being mounted for reciprocation on the table 1 a carriage6 slidably sustained by bearing boxes 7 formed to receive the guides 4,while fixed on the car riage is a substantially U-shaped bearing frame 8through which is threaded the operating screw 9 of a movable clampingblock or head 10 through the medium of which the gun barrel or otherpiece of tubing 11 to be acted upon is clamped in place on the car r1ae.

Extended transversely of the forward end of the table and journaled insuitable bearings 12 is a main drive shaft 13 having fixed thereon acone pulley 14 connected by a belt, not shown, with any suitable sourceof power, there being also fixed on said shaft a bevel gear 15 in meshwith a bevel pmlon 16 fixed on the rear end of a longitudinally disposedrotary mandrel 17 in turn journaled 1n bearings 18 and fixed againstlongitudinal movement in its bearing by means of collars 19 whichcontact with the ends of the bear? ings 18.

Extended transversely. of the table at a point in advance of andsuitably remote from the shaft 13 is a second shaft 20 journaled inbearings 21 and geared to and for operation from the shaft 13 by meansof a sprocket chain 22 arranged for travel on a sprocket pinion 23 fixedon the shaft 13 and a sprocket gear 24 fixed on the shaft 20, on one endof which there is also fixed a crank arm 25 provided with a series ofspaced openings or perforations 26 for a purpose which will presentlyappear, and havingits forward lower end weighted as at 27, whilefpivotedat one end on an arm 28 fixed to and projecting transversely outwardfrom the carriagefjg dgis a rigid connecting member or pitmanj; 29having its other or rear end pivoted to the crank arm 25 through themedium of a pintle or bolt 30 entered through one of the openings 26.

Screwed into or otherwise detachably en gaged with the forward end ofmandrel 17 is a tool shank 31 of a length to extend through the tube 11and having at its outer or for ward end a head 32 provided with alongitudinal recess or seat 33 in which is arranged a movable scrapingblade 34 having its sharpened active edge 35 curved inwardly at its endsas at 36,-the blade being provided at its longitudinal center with atransverse pivoting member or pin 38 for pivotally and movably securingthe blade in the head, while arranged in the recess 33 beneath the bladeis a leaf spring 39 of the form shown and having outwardly curvedportions 40 which bear on the inner edge of the blade respectively atoppositesides of its longitudinal center, thus yieldably supporting theblade which may move bodily and transversely into the recess 33, forendwise tilting movement.

In practice, and during operation of the shaft 13 which may be driven.from any suitable source of power motion will be imparted to the mandrel17 through the medium of the gear 15 and pinion 16 to in turn oper atethe polishing tool. During operation of the mandrel the shaft 20 will bedriven from the shaft 13 through the medium of the chain gearing, thusoperating the crank arm 25 and pitman 29 for reciprocating the carriage6 to move the tube 11 back and forth longitudinally of the polishingtool. It is to-be observed that during the polishing operation thecutting edge 35 of the blade will be pressed yieldably into contact withthe inner wall of the tube for removing rust and pits therefrom andeffecting a thorough polishing of the tube, and further that the blademay tilt longitudinally against the action of the spring 39 to properlyconform to a choke or tapered bore,

thus preventing injuryto the latter. Also it is to be noted that owingto the sharpened edge 35 of the blade being curved rearwardly at itsends all liability of the ends of the blade scraping or otherwisemarring the interior of the tube during rotation of the tool therein iswholly obviated.

In Fig. 9 there is illustrated a modified form of tool to be employedfor cleaning and polishing gun barrels and which comprises a pair ofopposed, reversely curved spring arms or blades 41, preferably made inone piece, as shown, and attached to a stem or shank 42 having athreaded portion 43 for engagement with a cleaning rod of usual form,there being fixed tothe blades 41, which are adapted for relativecompression toward each other, holders 44 designed to receive a fillingof any suitable cleaning, polishing material 45, such as cotton waste,

wire fabric or the like.

In practice, the tool, which is attached to a hand operated cleaningrod, will be passed through the gun barrel or other tube to be cleanedand polished, and owing to the form and arrangement of the arms 41 theholders 44 will automatically assume the proper inclination forfollowing the line of the bore to be cleaned.

Having thus described my invention, what I claim is:

1. In a machine of the class described, a frame, a carriage supportedfor reciprocation longitudinally of the frame, means for clamping a tubeupon the carriage, a mandrel supported for rotation upon the frame, atool holder connected with the mandrel, a tube engaging tool pivotallyconnected with the holder, and means for simultaneously rotating themandrel and reciprocating the carriage.

2. In a machine of the class described, a

frame, a shaft mounted for rotation transversely upon the frame, amandrel supported for rotation longitudinally of the frame, intermeshingbevel gears upon the transverse shaft and the mandrel, a countershaftdriven from the transverse shaft, a carriage supported for reciprocationlongitudinally of the frame, and having a laterally extending arm, acrank mounted upon the countershaft, a pitman connecting said crank withthe arm extending from the carriage, means for clamping a tube upon thecarriage, a tool holder connected with the mandrel, and a tube engagingtool pivotally connected with the holder.

3. In a machine of the class described, a frame,a carriage mounted forreciprocation longitudinally of the frame, means for clamping a tubeupon the carriage, a mandrel sup- Y ported for rotation upon the frame,a tool holder connected with the mandrel, a spring actuated tubeengaging tool pivotally connected with the holder, and means forsimultaneously rotating the mandrel and reciprocating the carriage.

4. In a machine of the class described, a frame, a carriage mounted forreciprocation longitudinally of the frame, a driving shaft supportedtransversely upon the frame, a countershaft supported for rotationtransversely of the frame, means for transmitting motion from thedriving shaft to the countershaft, a counterweighted crank upon thecountershaft, a pitman adjusting said crank with the carriage, a mandrelsupported for rotation longitudinally of the frame, means fortransmitting motion to the mandrel from the main driving shaft, meansfor clamping a tube upon the carriage,'a tool holder connected with themandrel, and a tube engag-

